What valve lies between the pulmonary trunk and the right ventricle?

What valve lies between the pulmonary trunk and the right ventricle?

• A. Pulmonary semilunar
• B. Aortic semilunar
• C. Tricuspid (R AV valve)
• D. Bicuspid (mitral)

Answer: (A)

The right ventricle ejects blood into the pulmonary trunk, and the valve located at that junction is the pulmonary semilunar valve. It has three crescent-shaped cusps that open when the ventricle contracts to push blood into the pulmonary arteries, and then snap shut as the ventricle relaxes to prevent any blood from flowing backward into the ventricle. This distinguishes it from the aortic semilunar valve, which sits between the left ventricle and the aorta, and from the atrioventricular valves (tricuspid on the right and mitral on the left), which regulate flow between the atria and ventricles.

The right ventricle ejects blood into the pulmonary trunk, and the valve located at that junction is the pulmonary semilunar valve. It has three crescent-shaped cusps that open when the ventricle contracts to push blood into the pulmonary arteries, and then snap shut as the ventricle relaxes to prevent any blood from flowing backward into the ventricle. This distinguishes it from the aortic semilunar valve, which sits between the left ventricle and the aorta, and from the atrioventricular valves (tricuspid on the right and mitral on the left), which regulate flow between the atria and ventricles.